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Unverified Commit ab3d2650 authored by Atish Patra's avatar Atish Patra Committed by Palmer Dabbelt
Browse files

RISC-V: Implement nosmp commandline option. 



nosmp command line option sets max_cpus to zero. No secondary harts
will boot if this is enabled. But present cpu mask will still point to
all possible masks.

Fix present cpu mask for nosmp usecase.

Signed-off-by: default avatarAtish Patra <atish.patra@wdc.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarPalmer Dabbelt <palmer@sifive.com>
parent 70114560

arch/riscv/kernel/smpboot.c

+11 −1
Original line number Diff line number Diff line
@@ -47,6 +47,17 @@ void __init smp_prepare_boot_cpu(void) 


void __init smp_prepare_cpus(unsigned int max_cpus)

{

	int cpuid;



	/* This covers non-smp usecase mandated by "nosmp" option */

	if (max_cpus == 0)

		return;



	for_each_possible_cpu(cpuid) {

		if (cpuid == smp_processor_id())

			continue;

		set_cpu_present(cpuid, true);

	}

}



void __init setup_smp(void)
@@ -74,7 +85,6 @@ void __init setup_smp(void) 


		cpuid_to_hartid_map(cpuid) = hart;

		set_cpu_possible(cpuid, true);

		set_cpu_present(cpuid, true);

		cpuid++;

	}